Utilities can improve water, gas and heating metering accuracy by an order of magnitude, while operating for up to 20 years on an “A”- size battery with Maxim’s MAXREFDES70# ultrasonic flow meter ...

Being able to measure ducted airflow cheaply and non-intrusively, like with this ultrasonic flow meter, could be a big deal for DIY projects and the trades in general. The principle behind the ...